Method and system of CT data correction

US7260172B2 · kind B2 · utility

Assignee

• General Electric Company · US

Inventors

• Jerome Stephen Arenson · Haifa, IL
• Evgeny Drapkin · Delafield, US
• Yanfeng Du · Rexford, US
• Lev Greenberg · Haifa, IL
• Oded Meirav · Haifa, IL
• David Ruimi · Netanya, IL
• John Eric Tkaczyk · Delanson, US
• Xiaoye Wu · Rexford, US

Key dates

• Filing date: Jan 25, 2007
• Grant date: Aug 21, 2007
• Expiry date: Jan 25, 2027

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S378/901
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

An adaptive CT data acquisition system and technique is presented whereby radiation emitted for CT data acquisition is dynamically controlled to limit exposure to those detectors of a CT detector assembly that may be particularly susceptible to saturation during a given data acquisition. The data acquisition technique recognizes that for a given subject size and position that pre-subject filtering and collimating of a radiation beam may be insufficient to completely prevent detector saturation. Therefore, the present invention includes implementation of a number of CT data correction techniques for correcting otherwise unusable data of a saturated CT detector. These data correction techniques include a nearest neighbor correction, off-centered phantom correction, off-centered synthetic data correction, scout data correction, planar radiogram correction, and a number of others. The invention is applicable with energy discriminating CT systems as well as with conventional CT systems and other multi-energy CT systems, such as dual kVp-based systems.